EN - 7
EN
3-WAY Multi Models
Table 2-1 Refrigerant tubing length and range of rise/fall
Indoor unit
45.0 kW
56.0 kW
71.0 kW
Capacity proportion of the indoor units to the outdoor unit
50 - 200 %
Minimum capacity of indoor units that can be connected
≤
22 type (equivalent to 0.8 horsepower)
Maximum number of indoor units (systems) that can be connected
24
Maximum allowable tubing length (L)
L
1
≤
120 m (equivalent length
≤
145 m)
(*1)
Difference between longest and shortest tubing lengths after the
No. 1 branch (
fi
rst branching point)
L
2
- L
8
≤
30 m
Maximum length of each tube branch
ℓ
1,
ℓ
2...
ℓ
8
≤
30 m
Maximum allowable height difference
between indoor and outdoor units
If outdoor unit is above
H
1
≤
50 m
If outdoor unit is below
H
2
≤
35 m
(*2)
Maximum allowable height difference between indoor units
H
3
≤
15 m
(*3)
Maximum length from the
fi
rst T-tee to the last T-tee
L
3
≤
2 m
(*1) The minimum length of tubes between outdoor units and indoor units is 7 m.
(*2) If cooling mode is expected to be used when the external temperature is 10°C or below, install so the
maximum length is 30 m.
(*3) Install so that the height difference between indoor units after the
fi
nal branch is within the limits shown in
Fig 3.
D1
H1
D2
D3
Dn
d21
d22
d24
d23
L5
L4
d4
d3
d2
d5
d1
Solenoid valve kit (purchased separately)
Externally mounted solenoid valve kit (sold separately)
Branch tube (purchased separately)
Ball valve (purchased separately)
T-tee (provided by installer)
Closed (pinch) weld
Fig. 6 Length of Refrigerant Tubing
2-tube line (gas tube, liquid tube)
CAUTION : 1) Each indoor unit requires a solenoid valve kit.
2) Never branch the tube between a solenoid valve kit and indoor unit.
3) Never branch the tube again after the header branching.
4) If using an external electric valve kit, install it between the solenoid
valve kit and the indoor unit.
Indoor unit
Solenoid
valve kit
Indoor unit
Header (purchased separately)
Solenoid
valve kit
Header
Maximum length of each
branch tube
d
≤
30 m
First branch
(Branch line)
L3 (Minimum length after
fi
rst
branch)
H2 (Height difference between indoor units)
≤
15 m
Maximum allowable tubing length L1
≤
120 m
L2 (Maximum length after
fi
rst branch)
Height difference between indoor units after the
fi
nal branch must be less than 4 m.
If height difference between indoor units after the
fi
nal branch cannot be less than 4 m,
divide the height difference between upper and lower units (2 to 1).
More than 4 m
X m
2X m or
more
4 m or less
3-tube line (discharge gas tube, suction gas tube, liquid tube)
Outdoor unit
External electric
valve kit
Maximum height differential of indoor units after
fi
nal branch
00-Installation̲All.indb 7
00-Installation̲All.indb 7
2012/09/07 9:32:39
2012/09/07 9:32:39
